“鸟类学”造句

他是一位鸟类学研究者.
He is a close student of birds.

他发现自己适于专攻鸟类学.
He found his vocation in ornithology.

用独立的笼子养鸟,有什么鸟类学的原因吗 ?
Is there an ornithological reason for keeping them in separate cages?